[inejge]

> You just have to use a secure device.

Secure as defined by a duo of monopolists. It's a contractual concept and doesn't have a firm relation to security-related characteristics. I'd trust GrapheneOS to be as secure as anything Google is capable of releasing, but that doesn't help them if Google refuses to vouch for a device running their OS. Which is also why your check/credit card analogy falls flat.

[charcircuit]

Graphene supports attestation and any backend service can add support for handling it. No one is forcing people to only use two.